A vision for sustainable nutrition
By 2050, everyone could have access to nutritious, culturally appropriate food while protecting the environment. The 2025 EAT-Lancet Commission on Healthy Diets From Sustainable Food Systems outlines how a “planetary health diet” could make this reality.
The report shows that combining this diet with sustainable farming and less food waste could feed 9.6 billion people equitably. Experts from more than 35 countries contributed, demonstrating that global food-related greenhouse gas emissions could drop by over half if nations act together.
Currently, about 30% of emissions come from producing, processing, and transporting food, while the rest comes mostly from fossil fuels and clearing forests for farmland.
Components of the planetary health diet
The diet emphasizes fruits, vegetables, whole grains, legumes, and nuts. It allows moderate meat and dairy while limiting added sugar, salt, and saturated fat. “This diet protects both human health and the planet,” said Dr. Walter Willett of Harvard University.
He recommends one daily serving of dairy and one serving of animal protein, such as fish, poultry, or eggs. Red meat, including beef and pork, should be limited to a 4-ounce serving once a week. “It’s flexible and balanced,” Willett said. “It resembles the Mediterranean diet in approach and variety.”
Systemic change beyond food choices
Johan Rockström, co-chair of the commission and director of the Potsdam Institute for Climate Impact Research, said changing diets alone is not enough. “We must also reduce food waste and adopt sustainable land, water, and ecosystem management,” he said. “Healthy food must be accessible and affordable for all.”
Industry resistance and misinformation
The 2019 EAT-Lancet report predicted that a global adoption of the planetary health diet could prevent 11.6 million premature deaths each year. The 2025 update now projects 15 million lives saved annually. In the United States, about 31% of premature adult deaths could be avoided.
Transforming the global food system could also save $5 trillion a year by reducing health costs, restoring ecosystems, and slowing climate change. The required investment — $200 to $500 billion — is small compared to the potential gains.
Opposition remains strong. In 2019, campaigns like #YestoMeat spread misinformation about the research. “We see similar tactics again,” Rockström said. “It is part of broader climate denialism.”
Willett added that campaigns like “Make America Healthy Again,” led by U.S. Health and Human Services Secretary Robert F. Kennedy Jr., promote meat-heavy diets while minimizing livestock’s climate impact. “Our report is based on independent global science,” he said.
The cost of inaction
If current practices continue, agricultural emissions could rise 33% by 2050. Nearly 70% of ecosystems have already lost over half of their natural areas, mainly to farming.
Adopting the planetary health diet could reduce emissions by 60% compared with 2020 levels. Cattle numbers would drop by 26%, freeing 11% of grazing land. “This could prevent further deforestation in the Amazon,” Willett said.
Meanwhile, aquatic food production could rise by 46%. Vegetables could increase 42%, fruits 61%, nuts 172%, and legumes 187%. Global food prices could drop about 3%.
Steps to a fair and sustainable food system
Christina Hicks from Lancaster University said the wealthiest 30% of people cause over 70% of food-related environmental damage. Fewer than 1% currently meet their food needs without harming nature.
The commission recommends shifting subsidies from meat and dairy to sustainable crops like fruits, vegetables, and legumes. Governments could also tax foods high in sugar, salt, or saturated fats while improving purchasing power to make healthy diets affordable.
Willett noted that traditional plant-based diets already align with planetary health principles. “We are not prescribing one global diet,” he said. “This approach respects cultural diversity and allows every region to eat healthily while protecting the planet.”
